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研究了一种等温锻造态Ｔｉ－４７Ａｌ－１Ｃｒ－１Ｖ－１．５Ｍｏ－１．５Ｍｏ－１．５Ｎｂ（原子分数，％）合金的超塑变形行为和组织变化．结果表明：在９００℃，ε＝５×１０－４ｓ－１和大气条件下，合金的应变速率敏感性指数ｍ大于０．５，延伸率为２００％．超塑变形时，在相晶内、晶界和层状组织中发生了动态再结晶动态再结晶可松弛界面滑动造成的应力集中，也为合金进一步的超望变形创造了组织条件．晶粒中发生｛１１１｝［１１０］普通位错滑移、｛１１１｝＜１０１］超点阵位错滑移和｛１１１｝＜１１２］类型孪生变形位锗滑移和孪生既对变形做出贡献，同时也作为调节机制起作用．
A superplastic deformation behavior and microstructure change of Ti-47Al-1Cr-1V-1.5Mo-1.5Mo-1.5Nb (atomic fraction,%) alloy at isothermal forging were investigated. The results show that under 900 ℃, ε = 5 × 10-4s-1 and atmospheric conditions, the strain rate sensitivity index m of the alloy is more than 0.5 and the elongation is 200%. In the superplastic deformation, dynamic recrystallization occurs in the grain boundaries and in the layered structure, which can relax the stress concentration caused by the sliding of the interface and also create the organizational conditions for the further super-deformation of the alloy. {111} [110] normal dislocation slip, {111} <101} superlattice slip and {111} <112] twin deformations occur both in the grain and in the grain Contribution, but also as a regulatory mechanism to work.